Webster’s Revised Unabridged Dictionary · 1913
Quartic
Quar′tic (kwa̤r′tĭk), a. [L. quartus fourth.] (Mach.) Of the fourth degree.
Quar′tic (kwa̤r′tĭk), n. (a) (Alg.) A quantic of the fourth degree. See Quantic. (b) (Geom.) A curve or surface whose equation is of the fourth degree in the variables.